1有三种工作模式:1:drp.主host/device可自由转换,类似电脑或macbook.
概念usb是通用串行总线(universal serial bus),分为host/device粮鲻
usb device
电钢琴电子键盘想知道usbtodevice端口和usbtohost端口的差异
电脑开机出现usb device over current status detected
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